Digital hygro-thermometer



FIG. 1 is a front elevational view showing my design;

FIG. 2 is a right side elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a top plan view of the design;

FIG. 5 is a rear elevational view of the design; and,

FIG. 6 is a bottom plan view of the design. 

The ornamental design for a digital hygro-thermometer, as shown. 